org.apache.wookie.server.LocaleHandler.java Source code

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Here is the source code for org.apache.wookie.server.LocaleHandler.java

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/*
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.wookie.server;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.ResourceBundle;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.commons.configuration.Configuration;
import org.apache.log4j.Logger;
import org.apache.wookie.Messages;

/**
 * A class to manage the locales as specified in the widgetserver.properties
 * @author Paul Sharples
 * @version $Id: LocaleHandler.java,v 1.2 2009-07-28 16:05:23 scottwilson Exp $
 */
public class LocaleHandler {

    static Logger _logger = Logger.getLogger(LocaleHandler.class.getName());

    private List<Locale> fLocales;

    private Locale fDefaultLocale;

    private final static String DEFAULT_LANGUGE = "en";

    private static LocaleHandler instance = null;

    private static Map<Locale, Messages> resourceBundles = null;

    private static final String BUNDLE_NAME = "org.apache.wookie.messages";

    private LocaleHandler() {
    }

    /**
     * @return 
     */
    public static synchronized LocaleHandler getInstance() {
        if (instance == null)
            instance = new LocaleHandler();
        return instance;
    }

    public synchronized void initialize(Configuration configuration) {
        String defaultLocale = configuration.getString("widget.default.locale");
        if (!defaultLocale.equals(null)) {
            fDefaultLocale = new Locale(defaultLocale);
        } else {
            fDefaultLocale = new Locale(DEFAULT_LANGUGE);
        }
        getLocalesFromConfig(configuration);
        initResourceBundles();
    }

    @SuppressWarnings("unchecked")
    private void getLocalesFromConfig(Configuration configuration) {
        List<Locale> localeList = new ArrayList<Locale>();
        List<String> localeStringList = configuration.getList("widget.locales");
        if ((localeStringList != null) && (localeStringList.size() > 0)) {
            for (final String language : localeStringList) {
                localeList.add(new Locale(language));
            }
        } else {
            // using default
            localeList.add(new Locale(DEFAULT_LANGUGE));
        }
        fLocales = localeList;
        localeStringList = null;
    }

    public List<Locale> getLocales() {
        return fLocales;
    }

    public Locale getDefaultLocale() {
        return fDefaultLocale;
    }

    public void showLocales() {
        for (Locale locale : fLocales) {
            _logger.debug("locale found:" + locale.toString());
        }
    }

    private void initResourceBundles() {
        resourceBundles = new HashMap<Locale, Messages>();
        for (final Locale locale : getLocales()) {
            final ResourceBundle rb = ResourceBundle.getBundle(BUNDLE_NAME, locale);
            resourceBundles.put(locale, new Messages(rb));
        }
    }

    public Messages getResourceBundle(final Locale locale) {
        Messages bundle = resourceBundles.get(locale);
        if (bundle == null) {
            bundle = resourceBundles.get(new Locale(DEFAULT_LANGUGE));
        }
        return bundle;
    }

    /**
     * Sets localized messages within the session
     * @param request
     */
    public static Messages localizeMessages(HttpServletRequest request) {
        HttpSession session = request.getSession(true);
        Messages localizedMessages = (Messages) session.getAttribute(Messages.class.getName());
        if (localizedMessages == null) {
            Locale locale = request.getLocale();
            localizedMessages = LocaleHandler.getInstance().getResourceBundle(locale);
            session.setAttribute(Messages.class.getName(), localizedMessages);
        }
        return localizedMessages;
    }

}